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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 147 (1987), S. 68-72 
    ISSN: 1432-072X
    Keywords: Differential sedimentation ; Synchronous cultures ; Bacillus subtilis ; Mean cell density
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A simple rapid method for preparing synchronous cultures of Bacillus subtilis has been used to investigate changes in density during the cell cycle. Asynchronous cells separated on a stepped Percoll density gradient had a mean cell density of 1.117 g ml-1±0.004. Samples from a synchronous culture exhibited variation (ca. 1.5%) in mean cell density which was greatest at the onset of cell division. An asynchronous control culture showed little variation in density. These results are discussed in relation to previous work on Escherichia coli.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-4726
    Keywords: Hearing loss ; Otosclerosis ; Stapedectomy ; Teflon ossicular implant ; Audiometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract This study reports the evaluation of hearing results after implantation of a Teflon piston of a different diameter in cases of otosclerosis requiring stapedotomy. By random selection, a Teflon piston with a shaft diameter of 0.3 mm was inserted in 34 cases and a piston with a shaft diameter of 0.4 mm in 26 cases. A retrospective analysis of the pre- and postsurgery audiological results of these two patient groups was carried out by microcomputer. A repeated statistical measures analysis of variance was used to test and estimate the air-conduction frequency-specific differences between the two prostheses with respect to changes in pre- and postoperative healing. The results of this comparative study of the two Teflon pistons with different diameters indicate statistically a greater hearing gain for the 0.4-mm prosthesis, especially in the lower frequencies.
    Type of Medium: Electronic Resource
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